browse hierarchyImplementors raise an error

> Hello,
>
> In a Pharo-1.0-10515-rc3 image,
>
> In the standard  class browser, when you click on the green arrow at the
> left of a method, to
> browse hierarchyImplementor, an error occur.
>
> I opened an issue: http://code.google.com/p/pharo/issues/detail?id=2305
>
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